<em>document.querySelector('#upload')</em>.<q>onChange</q> = <em>function(e)</em>{
	<em>const bool</em> = <b>{ }.toString.call</b>(<s>e</s>) === <u>'[object Event]'</u>
	<em>const bool</em> = <s>e</s>.<b>constructor</b> === <u>Event</u>
	<em>const bool</em> = <s>e</s> <b>instanceof</b> <u>Event</u>
}